Azo dye.



STATES PATENT: OF C KURT DESAMARIII, OF ELBERFEI LD, GERMANY, ASSIG-NOR 'IO FARBENFABRIKEN VORM. FRIEDR. BAYER & C0,, OF ELBERFELD, GERMANY, CORPORATION OF GERMANY.

AZO DYE.

No Drawing.

To all whom it may concern:

Be it known that I, Koirr D SAMARI, doctor of technical arts, chemist, citizen of the German Empire, residing at Elberfeld, Germany, have invented new and useful Improvements in Azo Dye, of which the fol centrated sulfuric acid wit-h a golden yel-- low coloration, it melts at 250 C. and yields upon reduction with stannous chlorid and hydrochloric acid chlo ortho phenylendiamln.

It has the following graphically representedformula tranilin are diazotized and sodium acetate.

is added to the resulting diazo solution to neutralize the free mineral acid. The diazo compound is then poured into an aqueous suspension of 211,5 parts of aceto-aceticacid-ortho-chloro-anilid containing 750 parts Specification of Letters Patent.

Patented Apr. 22, 1913.

Application filed April 9, 1912. Serial No. 689,631.

of a 20 per cent. sodium a l tate solution and the dye is filteredoff and ried.

2. Mix intimately 100 parts of a finely ground heavy spar wi h a solution of 20 parts of aluminum sul ate in 1200 parts of hot.water and add thereto a boilin suspension of 6 parts of azo dye obtaine according to the first example in 1000 parts of water containing 10 parts of anhydrous sodium carbonate,,boil the mixture and add to it while it is being stirred a hot solution of 30 parts of crystallized BaCl in 300 parts of water. Boil, filter off and wash. The color of this lake is greenish-yellow.

The lakes and the coloring matter can also be produced in one operation.

I claim:

The new dyestufi derivable from diazotized para-chloro-ortho-nitranilin and aceto- 'acetic-acid-ortho-chloro-anilid having the following graphically represented formula:

CH3 v i which is after being dried and pulverized a powder insoluble in water, soluble in concentrated'sulfuric acid with a golden yellow color; when in a pure state melting at 250 0.; yielding upon reduction with stannous chlorid and hydrochloric acid chloro-orthophenylendiamin and furnishing .valuable color lakes, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

KURT DESAMARI. [1,. s.] Witnesses:

HELEN Norm, ALBERT NUFER. 

